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EP0315055B1 - Gas valve-testing method and apparatus for carrying out the method - Google Patents

Gas valve-testing method and apparatus for carrying out the method Download PDF

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Publication number
EP0315055B1
EP0315055B1 EP88117908A EP88117908A EP0315055B1 EP 0315055 B1 EP0315055 B1 EP 0315055B1 EP 88117908 A EP88117908 A EP 88117908A EP 88117908 A EP88117908 A EP 88117908A EP 0315055 B1 EP0315055 B1 EP 0315055B1
Authority
EP
European Patent Office
Prior art keywords
valve
flame
fuel
monitoring unit
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88117908A
Other languages
German (de)
French (fr)
Other versions
EP0315055A1 (en
Inventor
Reiner Kind
Dietmar Manz
Ulrich Ortlinghaus
Franz-Josef Wertenbruch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nv Vaillant Sa
VAILLANT B.V.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Vaillant BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, Vaillant BV filed Critical Vaillant Austria GmbH
Priority to AT88117908T priority Critical patent/ATE99402T1/en
Publication of EP0315055A1 publication Critical patent/EP0315055A1/en
Application granted granted Critical
Publication of EP0315055B1 publication Critical patent/EP0315055B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/12—Burner simulation or checking
    • F23N2227/16—Checking components, e.g. electronic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/10—Fail safe for component failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/18—Detecting fluid leaks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods

Definitions

  • the present invention relates to a method for checking the closing of a fuel valve and a device for carrying out the method.
  • Oil-fired as well as gas-fired instantaneous water heaters, circulating water heaters with and without process water preparation, as well as boilers and space heaters can be regarded as fuel-heated devices. It does not matter whether these devices have an electronic or a thermoelectric flame monitoring device, if it is only possible to monitor the flame of the main burner.
  • valves of such devices usually work without problems for relatively long times. Occasionally, a fuel valve may get stuck, for example due to dirt or excessive wear.
  • the controller that controls the fuel-heated device issues a shutdown command, only this is not carried out. The burner then continues to burn until the safety thermostat, which is in accordance with the regulations, interlocks the device.
  • a switch-on monitoring method is known from US Pat. No. 4,131,419, in which the tightness of a main gas valve is checked by testing the formation of a main gas flame by means of a flame monitoring device after the release of a pilot burner valve. If such a main gas flame arises within a certain test time, this means that the main gas valve connected in series with the pilot gas valve is leaking. Disadvantages of this checking method are, on the one hand, that only the main gas valve, but not the pilot gas valve, can be checked in this way, and, on the other hand, that each burner start-up is delayed. The latter has a very negative effect, for example, in gas-water heaters, since hot water, in particular in the case of instantaneous water heaters, is only available with this time delay.
  • the present invention has for its object to regularly test at least one of the existing valves of the fuel-heated device when switching off the fuel-heated device.
  • the object is achieved according to the invention by the characterizing part of the method claim.
  • the switch-off monitoring method has the advantage over the switch-on monitoring method that the user of the fuel-heated device does not notice anything of the test, because the device is switched off anyway. In the other case, switching on the device is delayed by the test time.
  • a device for carrying out this switch-off monitoring method is characterized by the characterizing features of claim 2. Particularly advantageous refinements and developments of the invention will become apparent from the following description, which explains an embodiment of the invention in more detail.
  • a gas-heated circulating water heater 1 has a heat exchanger 2 and a burner 3 that heats it, which is fed from a gas supply line 6 controlled with a first gas valve 4 to be monitored and a second gas valve 5 not to be monitored.
  • the heat exchanger 2 is connected to a return line 8 provided with a circulation pump 7 and to a flow line 10 provided with a temperature sensor 9.
  • a central control, regulating and monitoring unit 11 is provided, which is designed together with a switch-off monitoring device 12 as a microcomputer control.
  • the burner 3 is assigned an ignition electrode 14, which is fed by an ignition device 15 via a line 16, the ignition device 15 receiving its activation signal via a line 17 from the monitoring unit 11.
  • a burner 3 is assigned a flame detection electrode 19, which is connected via a line 20 to a flame detection device 21, the output line 22 of which is connected to the monitoring unit 11 and in parallel to the switch-off monitoring unit 12.
  • An output line 23 of the monitoring unit 11 is connected to a solenoid 24 of the valve 4 to be monitored, which is designed as a solenoid valve, and is also connected via a branching line 25 to an input of the switch-off monitoring unit 12.
  • Another output 26 of the monitoring unit is via a line 27 to the drive motor 28 of the circulation pump 7 connected.
  • the switch-off monitoring unit 12 is connected to the monitoring unit 11 via a line 30. Upstream and downstream of the pump 7, two risers 32 and 33 are connected, which lead to a membrane switch 34.
  • This membrane switch 34 forms the drive for the gas valve 5 which is not to be monitored.
  • This gas valve 5 is opened when the pump 7 builds up a sufficient delivery pressure because it can then be assumed that a sufficient water throughput through the heat exchanger 2 takes place.
  • This valve 5 is part of a so-called water shortage protection.
  • Other drives for this gas valve 5, which is not to be checked, would also be possible, for example it could be designed as a separate gas solenoid valve, it could also be combined to form a double-seat valve with the valve 4, it could also be a valve for an ignition fuse or a room thermostat.
  • valves 4 and 5 are designed as solenoid valves, it is also possible in the context of the present invention to test both valves alternately when switched off.
  • An oscillator 40 is provided which generates a pulse frequency with a 10 Hz clock.
  • the oscillator is through an output line 41 connected to an input of an AND gate 42.
  • This AND element 42 has the line 22 from the flame detection device 21 as a further input, this line 22 is connected via a branching line 43 to a negated reset input 44 of a binary counter 45.
  • a third, negated input 46 of the AND element 42 is connected to the line 25 of the monitoring unit 11.
  • An output line 47 of the AND element 42 is connected to the counting input of the binary counter 45.
  • the binary counter 45 is assigned a comparator 48, which then emits a signal at its output when a certain counter reading has been reached or exceeded.
  • the output line 30 leads back to the monitoring unit 11, where the circulating water heater 1 is then locked in a locking manner.
  • the circuit according to FIG. 2 has the following function, it being pointed out that, although it can be embodied as a circuit shown, it is actually constructed as a software program of a microcomputer. However, only the mode of operation is essential, and this can be achieved both with the circuit shown and with a software program. If it is determined by comparing the actual value, given by the sensor 9, with a desired value transmitter, not shown, that further heating of the heat exchanger 2 by the burner 3 is not is more necessary, a closing command for the gas line 6 is given.
  • the gas valve 4 to be checked is closed by the monitoring unit 11 removing the voltage on the line 23 during the switch-off test that is now starting, so that the solenoid 24 of the solenoid valve 4 is de-energized, which means that no signal is present on the line 25. Since input 46 is negated, a signal is present at this input of AND element 42.
  • the oscillator 40 which oscillates continuously, passes on its pulse voltage via line 41 to the AND element 42. Voltage is also present at the AND element 42 at the third input, namely via the line 22, because a flame has previously been reported by the electrode 19 in the ionization process. This means that after the closing command for the gas solenoid valve 24/4 counting pulses can reach the binary counter 45 via line 47.
  • the presence of a voltage on the line 43 is negated in the negated delete input 44, so it does not matter here.
  • the counter 45 counts up until its counter content matches the value set at the comparison stage 48. This means that, although there is a switch-off command for the fuel-heated device 1, a flame message is still emitted, which can actually only occur if the gas solenoid valve 4/24 has not closed. In this case, a fault message is given via the output line 30. Closes the solenoid valve 4/24 properly, however, the flame detection signal of the flame monitoring device 21 will go out before the counter value set at the comparison stage 48 is reached, so that firstly the AND element 42 is blocked again via the line 22 and secondly that the counter 45 is reset via the extinguishing input 44 becomes.
  • the gas solenoid valve 4/24 to be monitored is properly closed, so that there is no need to report a fault. It is possible to have this self-test process carried out each time the gas or oil-fired device to be monitored is switched off. It would also be possible to monitor the other valve 5 in the same way, particularly if it is a solenoid valve.
  • the monitoring unit 11 causes the other valve 5 to close. This can be done by removing the voltage on the line 27, because then the pump 7 comes to a standstill and the valve controlled by the pump pressure 5 closes. If the device was designed with two solenoid valves, the voltage would be removed from the other solenoid valve. In the case of the formation of the second gas valve as a safety valve would be in the circuit of the thermoelectric Ignition protection can be intervened with an opening contact. In the case of a room thermostat, it could be heated by an electrical resistor, so that the second valve is switched off.
  • the pump 7 can be switched once so that it only runs when the solenoid valve 4/24 is open. However, it may also be possible for the pump 7 to run continuously, regardless of whether the heater is heating or not.
  • the switch-off monitoring method can always be carried out when the burner 3 is switched off, regardless of whether the pump 7 is also switched off or runs. However, if it is also switched off, it must be switched off with a delay compared to the valve 4 or / and 5 to be checked.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Überprüfung des Schließens eines Brennstoffventils und einer Vorrichtung zur Durchführung des Verfahrens.The present invention relates to a method for checking the closing of a fuel valve and a device for carrying out the method.

Als brennstoffbeheizte Geräte sind sowohl öl- wie auch gasbeheizte Durchlaufwasserheizer, Umlaufwasserheizer mit und ohne Gebrauchswasserbereitung sowie Kessel und Raumheizer anzusehen. Hierbei ist es gleichgültig, ob diese Geräte eine elektronische oder eine thermoelektrische Flammenüberwachungseinrichtung aufweisen, wenn es nur möglich ist, die Flamme des Hauptbrenners zu überwachen.Oil-fired as well as gas-fired instantaneous water heaters, circulating water heaters with and without process water preparation, as well as boilers and space heaters can be regarded as fuel-heated devices. It does not matter whether these devices have an electronic or a thermoelectric flame monitoring device, if it is only possible to monitor the flame of the main burner.

Die Ventile solcher Geräte arbeiten für relativ lange Zeiten in der Regel störungsfrei. Gelegentlich kann es einmal vorkommen, beispielsweise durch eingedrungenen Schmutz oder durch übermäßige Abnutzung, daß ein Brennstoffventil hängenbleibt. Der Regler, der das brennstoffbeheizte Gerät steuert, gibt zwar einen Abschaltbefehl, nur wird dieser nicht ausgeführt. Es kommt dann zum weiteren Brennen des Brenners, bis der nach den Vorschriften vorhandene Sicherheitsthermostat eine verriegelnde Abschaltung des Gerätes vornimmt.The valves of such devices usually work without problems for relatively long times. Occasionally, a fuel valve may get stuck, for example due to dirt or excessive wear. The controller that controls the fuel-heated device issues a shutdown command, only this is not carried out. The burner then continues to burn until the safety thermostat, which is in accordance with the regulations, interlocks the device.

Aus der US-PS 4 131 419 ist ein Einschalt-Überwachungsverfahren bekannt, bei dem die Dichtheit eines Hauptgasventils überprüft wird, indem nach der Freigabe eines Zündbrennerventils mittels einer Flammenüberwachungseinrichtung das Entstehen einer Hauptgasflamme getestet wird. Entsteht innerhalb einer bestimmten Testzeit eine solche Hauptgasflamme, bedeutet dies, daß das zu dem Zündgasventil in Reihe geschaltete Hauptgasventil undicht ist. Nachteilig bei diesem Überprüfungsverfahren ist zum einen, daß sich nur das Hauptgasventil, nicht aber des Zündgasventil auf diese Weise überprüfen läßt, und zum anderen, daß jeder Einschaltvorgang des Brenners mit einer Zeitverzögerung erfolgt. Letzteres wirkt sich beispielsweise bei Gas-Wasser-Heizern sehr negativ aus, da dadurch warmes Wasser, insbesondere bei Durchlauferhitzern, erst mit dieser Zeitverzögerung zur Verfügung steht.A switch-on monitoring method is known from US Pat. No. 4,131,419, in which the tightness of a main gas valve is checked by testing the formation of a main gas flame by means of a flame monitoring device after the release of a pilot burner valve. If such a main gas flame arises within a certain test time, this means that the main gas valve connected in series with the pilot gas valve is leaking. Disadvantages of this checking method are, on the one hand, that only the main gas valve, but not the pilot gas valve, can be checked in this way, and, on the other hand, that each burner start-up is delayed. The latter has a very negative effect, for example, in gas-water heaters, since hot water, in particular in the case of instantaneous water heaters, is only available with this time delay.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, wenigstens eins der vorhandenen Ventile des brennstoffbeheizten Gerätes beim Abschalten des brennstoffbeheizten Gerätes regelmäßig zu testen.The present invention has for its object to regularly test at least one of the existing valves of the fuel-heated device when switching off the fuel-heated device.

Die Lösung der Aufgabe erfolgt erfindungsgemäß durch den kennzeichnenden Teil des Verfahrensanspruchs. Das Ausschalt-Überwachungsverfahren bietet gegenüber dem Einschalt-Überwachungsverfahren den Vorteil, daß der Benutzer des brennstoffbeheizten Gerätes vom Test nichts merkt, weil das Gerät ja ohnehin abgeschaltet wird. Im anderen Fall verzögert sich das Einschalten des Gerätes um die Testzeit.The object is achieved according to the invention by the characterizing part of the method claim. The switch-off monitoring method has the advantage over the switch-on monitoring method that the user of the fuel-heated device does not notice anything of the test, because the device is switched off anyway. In the other case, switching on the device is delayed by the test time.

Eine Vorrichtung zur Durchführung dieses Ausschalt-Überwachungsverfahrens ist durch die kennzeichnenden Merkmale des Anspruchs 2 charakterisiert. Besonders vorteilhafte Ausbildungen und Weiterbildungen der Erfindung gehen aus der nachfolgenden Beschreibung hervor, die ein Ausführungsbeispiel der Erfindung näher erläutert.A device for carrying out this switch-off monitoring method is characterized by the characterizing features of claim 2. Particularly advantageous refinements and developments of the invention will become apparent from the following description, which explains an embodiment of the invention in more detail.

Es zeigen:

  • Figur 1 eine Prinzipdarstellung eines Umlaufwasserheizers und die
  • Figur 2 ein Ausführungsbeispiel der Überwachungsschaltung.
Show it:
  • Figure 1 is a schematic diagram of a water heater and the
  • Figure 2 shows an embodiment of the monitoring circuit.

In beiden Figuren bedeuten gleiche Bezugszeichen jeweils die gleichen Einzelheiten.In both figures, the same reference symbols denote the same details.

Ein gasbeheizter Umlaufwasserheizer 1 weist einen Wärmetauscher 2 und einen ihn beheizenden Brenner 3 auf, der aus einer mit einem ersten zu überwachenden Gasventil 4 und einem zweiten nicht zu überwachenden Gasventil 5 beherrschten Gaszuleitung 6 gespeist ist. Der Wärmetauscher 2 ist an eine mit einer Umwälzpumpe 7 versehene Rücklaufleitung 8 und eine mit einem Temperaturfühler 9 versehene Vorlaufleitung 10 angeschlossen. Es ist eine zentrale Steuer-, Regel- und Überwachungseinheit 11 vorgesehen, die zusammen mit einer Ausschalt-Überwachungseinrichtung 12 als Mikrocomputersteuerung ausgebildet ist. Dem Brenner 3 ist eine Zündelektrode 14 zugeordnet, die von einer Zündeinrichtung 15 über eine Leitung 16 gespeist ist, wobei die Zündeinrichtung 15 ihr Aktivierungssignal über eine Leitung 17 von der Überwachungseinheit 11 erhält. Dem Brenner 3 ist eine Flammenmeldeelektrode 19 zugeordnet, die über eine Leitung 20 mit einer flammenmeldeeinrichtung 21 verbunden ist, deren Ausgangsleitung 22 auf die Überwachungselnheit 11 und parallel hierzu auf die Ausschalt-Überwachungseinheit 12 geschaltet ist. Eine Ausgangsleitung 23 der Überwachungseinheit 11 ist sowohl mit einer Magnetspule 24 des zu überwachenden als Magnetventil ausgebildeten Ventils 4 verbunden wie auch über eine abzweigende Leitung 25 auf einen Eingang der Ausschalt-Überwachungseinheit 12 geschaltet. Ein weiterer Ausgang 26 der Überwachungseinheit ist über eine Leitung 27 mit dem Antriebsmotor 28 der Umwälzpumpe 7 verbunden. Die Ausschalt-Überwachungseinheit 12 ist über eine Leitung 30 mit der Überwachungseinheit 11 verbunden. Stromauf und stromab der Pumpe 7 sind zwei Steigleitungen 32 und 33 angeschlossen, die zu einem Membranschalter 34 führen. Dieser Membranschalter 34 bildet den Antrieb für das nicht zu überwachende Gasventil 5. Dieses Gasventil 5 wird geöffnet, wenn die Pumpe 7 einen ausreichenden Förderdruck aufbaut, weil dann davon ausgegangen werden kann, daß ein ausreichender Wasserdurchsatz durch den Wärmetauscher 2 stattfindet. Dieses Ventil 5 ist Teil einer sogenannten Wassermangelsicherung. Es wären auch andere Antriebe für dieses nicht zu überprüfende Gasventil 5 möglich, es könnte beispielsweise als gesondertes Gasmagnetventil ausgebildet sein, es könnte auch zu einem Doppelsitzventil mit dem Ventil 4 zusammengefaßt sein, es könnte auch ein Ventil einer Zündsicherung oder eines Raumthermostaten sein.A gas-heated circulating water heater 1 has a heat exchanger 2 and a burner 3 that heats it, which is fed from a gas supply line 6 controlled with a first gas valve 4 to be monitored and a second gas valve 5 not to be monitored. The heat exchanger 2 is connected to a return line 8 provided with a circulation pump 7 and to a flow line 10 provided with a temperature sensor 9. A central control, regulating and monitoring unit 11 is provided, which is designed together with a switch-off monitoring device 12 as a microcomputer control. The burner 3 is assigned an ignition electrode 14, which is fed by an ignition device 15 via a line 16, the ignition device 15 receiving its activation signal via a line 17 from the monitoring unit 11. A burner 3 is assigned a flame detection electrode 19, which is connected via a line 20 to a flame detection device 21, the output line 22 of which is connected to the monitoring unit 11 and in parallel to the switch-off monitoring unit 12. An output line 23 of the monitoring unit 11 is connected to a solenoid 24 of the valve 4 to be monitored, which is designed as a solenoid valve, and is also connected via a branching line 25 to an input of the switch-off monitoring unit 12. Another output 26 of the monitoring unit is via a line 27 to the drive motor 28 of the circulation pump 7 connected. The switch-off monitoring unit 12 is connected to the monitoring unit 11 via a line 30. Upstream and downstream of the pump 7, two risers 32 and 33 are connected, which lead to a membrane switch 34. This membrane switch 34 forms the drive for the gas valve 5 which is not to be monitored. This gas valve 5 is opened when the pump 7 builds up a sufficient delivery pressure because it can then be assumed that a sufficient water throughput through the heat exchanger 2 takes place. This valve 5 is part of a so-called water shortage protection. Other drives for this gas valve 5, which is not to be checked, would also be possible, for example it could be designed as a separate gas solenoid valve, it could also be combined to form a double-seat valve with the valve 4, it could also be a valve for an ignition fuse or a room thermostat.

Sind beide Ventile 4 und 5 als Magnetventile ausgebildet, so ist es auch möglich, im Rahmen der vorliegenden Erfindung beide Ventile beim Ausschalten wechselseitig zu testen.If both valves 4 and 5 are designed as solenoid valves, it is also possible in the context of the present invention to test both valves alternately when switched off.

Das erfindungsgemäße Verfahren arbeitet wie folgt:
Es ist ein Oszillator 40 vorgesehen, der eine Impulsfrequenz mit einem 10-Hz-Takt erzeugt. Der Oszillator ist über eine Ausgangsleitung 41 mit einem Eingang eines Und-Gliedes 42 verbunden. Dieses Und-Glied 42 weist als weiteren Eingang die Leitung 22 von der Flammenmeldeeinrichtung 21 auf, diese Leitung 22 ist über eine abzweigende Leitung 43 mit einem negierten Rücksetzeingang 44 eines Binärzählers 45 verbunden. Ein dritter, negierter Eingang 46 des Und-Gliedes 42 ist an die Leitung 25 der Überwachungseinheit 11 angeschlossen. Eine Ausgangsleitung 47 des Und-Gliedes 42 ist auf den Zähleingang des Binärzählers 45 geschaltet. Dem Binärzähler 45 ist ein Vergleicher 48 zugeordnet, der an seinem Ausgang dann ein Signal abgibt, wenn ein gewisser Zählerstand erreicht ist oder überschritten wird. Die Ausgangsleitung 30 führt zurück zur Überwachungseinheit 11, hier wird dann ein verriegelndes Stillsetzen des Umlaufwasserheizers 1 vorgenommen.The method according to the invention works as follows:
An oscillator 40 is provided which generates a pulse frequency with a 10 Hz clock. The oscillator is through an output line 41 connected to an input of an AND gate 42. This AND element 42 has the line 22 from the flame detection device 21 as a further input, this line 22 is connected via a branching line 43 to a negated reset input 44 of a binary counter 45. A third, negated input 46 of the AND element 42 is connected to the line 25 of the monitoring unit 11. An output line 47 of the AND element 42 is connected to the counting input of the binary counter 45. The binary counter 45 is assigned a comparator 48, which then emits a signal at its output when a certain counter reading has been reached or exceeded. The output line 30 leads back to the monitoring unit 11, where the circulating water heater 1 is then locked in a locking manner.

Die Schaltung nach Figur 2 weist folgende Funktion auf, wobei darauf hinzuweisen ist, daß sie zwar als dargestellte Schaltung ausbildbar ist, in Wirklichkeit allerdings als Software-Programm eines Mikrocomputers aufgebaut ist. Wesentlich ist aber nur die Funktionsweise, und die kann sowohl mit der dargestellten Schaltung wie auch mit einem Software-Programm erreicht werden. Wenn durch Vergleich des Ist-Wertes, gegeben vom Fühler 9, mit einem nicht dargestellten Soll-Wertgeber ermittelt wird, daß ein weiteres Beheizen des Wärmetauschers 2 durch den Brenner 3 nicht mehr notwendig ist, so wird ein Schließbefehl für die Gasleitung 6 gegeben. Das zu überprüfende Gasventil 4 wird geschlossen, indem bei dem jetzt anlaufenden Ausschalttest die Überwachungseinheit 11 die Spannung auf der Leitung 23 wegnimmt, so daß die Magnetspule 24 des Magnetventils 4 stromlos wird, was bedeutet, daß auf der Leitung 25 kein Signal mehr anliegt. Da der Eingang 46 negiert ist, liegt ein Signal an diesem Eingang des Und-Gliedes 42 an. Der Oszillator 40, der permanent schwingt, gibt seine Impulsspannung über die Leitung 41 auf das Und-Glied 42 weiter. Auch am dritten Eingang, nämlich über die Leitung 22, liegt Spannung am Und-Glied 42 an, weil bislang eine Flamme von der Elektrode 19 im Ionisationsverfahren gemeldet wurde. Damit können jetzt nach dem Schließbefehl für das Gasmagnetventil 24/4 Zählimpulse über die Leitung 47 auf den Binärzähler 45 gelangen. Das Vorhandensein einer Spannung auf der Leitung 43 wird im negierten Löscheingang 44 negiert, spielt also hier keine Rolle. Der Zähler 45 zählt hoch, bis sein Zählerinhalt mit dem an der Vergleichsstufe 48 eingestellten Wert übereinstimmt. Das bedeutet, daß, obgleich ein Ausschaltbefehl für das brennstoffbeheizte Gerät 1 vorliegt, eine Flammenmeldung weiter abgegeben wird, die eigentlich nur zustande kommen kann, wenn das Gasmagnetventil 4/24 nicht geschlossen hat. In diesem Fall wird über die Ausgangsleitung 30 eine Störungsmeldung gegeben. Schließt das Magnetventil 4/24 jedoch ordnungsgemäß, so wird vor Erreichen des an der Vergleichsstufe 48 eingestellten Zählerstandes das Flammenmeldesignal der Flammenüberwachungseinrichtung 21 erlöschen, so daß erstens das Und-Glied 42 wieder über die Leitung 22 gesperrt wird und daß zweitens der Zähler 45 über den Löscheingang 44 zurückgesetzt wird. In diesem Fall ist ein ordnungsgemäßes Schließen des zu überwachenden Gasmagnetventils 4/24 gegeben, so daß keine Störungsmeldung zu erfolgen braucht. Es ist möglich, diesen Selbsttestvorgang bei jedem Regelabschaltvorgang des zu überwachenden gas- oder ölbeheizten Gerätes vornehmen zu lassen. Es wäre auch möglich, das andere Ventil 5 auf die gleiche Art und Weise zu überwachen, insbesondere dann, wenn es sich hier um ein Magnetventil handelt.The circuit according to FIG. 2 has the following function, it being pointed out that, although it can be embodied as a circuit shown, it is actually constructed as a software program of a microcomputer. However, only the mode of operation is essential, and this can be achieved both with the circuit shown and with a software program. If it is determined by comparing the actual value, given by the sensor 9, with a desired value transmitter, not shown, that further heating of the heat exchanger 2 by the burner 3 is not is more necessary, a closing command for the gas line 6 is given. The gas valve 4 to be checked is closed by the monitoring unit 11 removing the voltage on the line 23 during the switch-off test that is now starting, so that the solenoid 24 of the solenoid valve 4 is de-energized, which means that no signal is present on the line 25. Since input 46 is negated, a signal is present at this input of AND element 42. The oscillator 40, which oscillates continuously, passes on its pulse voltage via line 41 to the AND element 42. Voltage is also present at the AND element 42 at the third input, namely via the line 22, because a flame has previously been reported by the electrode 19 in the ionization process. This means that after the closing command for the gas solenoid valve 24/4 counting pulses can reach the binary counter 45 via line 47. The presence of a voltage on the line 43 is negated in the negated delete input 44, so it does not matter here. The counter 45 counts up until its counter content matches the value set at the comparison stage 48. This means that, although there is a switch-off command for the fuel-heated device 1, a flame message is still emitted, which can actually only occur if the gas solenoid valve 4/24 has not closed. In this case, a fault message is given via the output line 30. Closes the solenoid valve 4/24 properly, however, the flame detection signal of the flame monitoring device 21 will go out before the counter value set at the comparison stage 48 is reached, so that firstly the AND element 42 is blocked again via the line 22 and secondly that the counter 45 is reset via the extinguishing input 44 becomes. In this case, the gas solenoid valve 4/24 to be monitored is properly closed, so that there is no need to report a fault. It is possible to have this self-test process carried out each time the gas or oil-fired device to be monitored is switched off. It would also be possible to monitor the other valve 5 in the same way, particularly if it is a solenoid valve.

Wird eine Störung aufgrund des Nichtschließens des zu überwachenden Ventils 4 gegeben, veranlaßt die Überwachungseinheit 11 ein Schließen des anderen Ventils 5. Dies kann durch Wegnehmen der Spannung auf der Leitung 27 erfolgen, weil dann die Pumpe 7 zum Stillstand kommt und das vom Pumpendruck gesteuerte Ventil 5 schließt. Im Falle der Ausführung des Gerätes mit zwei Magnetventilen würde die Spannung vom anderen Magnetventil weggenommen werden. Im Falle der Ausbildung des zweiten Gasventils als Sicherungsventil würde in den Stromkreis der thermoelektrischen Zündsicherung mit einem öffnenden Kontakt eingegriffen werden. Im Falle eines Raumthermostaten könnte man diesen über einen elektrischen Widerstand beheizen, so daß dieser eine Abschaltung des zweiten Ventils bewirkt.If a malfunction occurs due to the valve 4 to be monitored not closing, the monitoring unit 11 causes the other valve 5 to close. This can be done by removing the voltage on the line 27, because then the pump 7 comes to a standstill and the valve controlled by the pump pressure 5 closes. If the device was designed with two solenoid valves, the voltage would be removed from the other solenoid valve. In the case of the formation of the second gas valve as a safety valve would be in the circuit of the thermoelectric Ignition protection can be intervened with an opening contact. In the case of a room thermostat, it could be heated by an electrical resistor, so that the second valve is switched off.

Es hat sich eingebürgert, bei Umlaufwasserheizern bestimmte Schaltungen der Pumpe 7 vorzusehen. Die Pumpe 7 kann einmal so geschaltet sein, daß sie nur läuft, wenn das Magnetventil 4/24 offen ist. Es kann aber auch möglich sein, daß die Pumpe 7 permanent durchläuft, unabhängig davon, ob das Heizgerät heizt oder nicht heizt. Das Ausschalt-Überwachungsverfahren kann immer bei der Regelabschaltung des Brenners 3 durchgeführt werden, gleichgültig, ob die Pumpe 7 mit abgeschaltet wird oder durchläuft. Wenn sie jedoch mit abgeschaltet wird, muß sie gegenüber dem zu Überprüfenden Ventil 4 oder/und 5 verzögert abgeschaltet werden.It has become common practice to provide certain circuits of the pump 7 in the case of circulating water heaters. The pump 7 can be switched once so that it only runs when the solenoid valve 4/24 is open. However, it may also be possible for the pump 7 to run continuously, regardless of whether the heater is heating or not. The switch-off monitoring method can always be carried out when the burner 3 is switched off, regardless of whether the pump 7 is also switched off or runs. However, if it is also switched off, it must be switched off with a delay compared to the valve 4 or / and 5 to be checked.

Claims (2)

  1. A method of testing the closing of a fuel valve (4 or 5) of a fuel-firing appliance, which comprises a burner that is controlled by the valve (4 or 5), a monitoring unit (11) for controlling the appliance, a flame indicator (21) for generating a flame signal in response to the detection of a flame, and another fuel valve (5 or 4), which is connected in series to the valve to be tested, characterized in that whenever the fuel-firing appliance (1) is to be turned off the monitoring unit (11) delivers a closing command to the valve (4 or 5) that is to be tested whereas the other valve (5 or 4) is held open and if the flame signal continues to appear after a certain time a fault signal is generated and is used to close the other valve (5 or 4).
  2. An apparatus for testing the closing of a fuel valve (4 or 5) of a fuel-firing appliance, which comprises a burner that is controlled by the valve (4 or 5), a monitoring unit (11) for controlling the appliance, a flame indicator (21) for generating a flame signal in response to the detection of a flame, and another fuel valve (5 or 4), which is connected in series to the valve to be tested, characterized in that an AND gate (42), a binary counter (45) and a comparator (48) are provided, the AND gate (42) has inputs connected to a pulse frequency-generating oscillator (40) and to the flame indicator (21) and has a negated third input (46), which is connected to a control line (25) leading from the monitoring unit (11) to the fuel valve (4 or 5) to be tested, that the AND gate (42) and another line (43) for resetting the counter (45) in the absence of a flame signal are connected to the counter (45) by the flame indicator (21) and that the comparator (48) delivers a fault signal and closes the other valve (5 or 4) when the counter (45) has reached a predetermined count, which will be the case when the flame signal of the flame indicator (21) is continued.
EP88117908A 1987-11-06 1988-10-27 Gas valve-testing method and apparatus for carrying out the method Expired - Lifetime EP0315055B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88117908T ATE99402T1 (en) 1987-11-06 1988-10-27 PROCEDURE FOR TESTING A GAS VALVE AND DEVICE FOR CARRYING OUT THE PROCEDURE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3737764 1987-11-06
DE3737764 1987-11-06
DE3827294 1988-08-11
DE3827294 1988-08-11

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EP0315055A1 EP0315055A1 (en) 1989-05-10
EP0315055B1 true EP0315055B1 (en) 1993-12-29

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831067C2 (en) * 1998-07-10 2000-05-31 Honeywell Bv Procedure for leak testing of gas valves
DE102022101305A1 (en) 2022-01-20 2023-07-20 Ebm-Papst Landshut Gmbh Procedure for failsafe and lean ignition of a combustible gas-air mixture on a gas burner

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035134A (en) * 1975-10-14 1977-07-12 Johnson Controls, Inc. Electronic valve seat leak detector
US4211526A (en) * 1978-11-06 1980-07-08 Honeywell Inc. Control system for redundant valves
US4278419A (en) * 1979-04-30 1981-07-14 Robertshaw Controls Company Primary oil burner safety control and intermittent ignition system

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EP0315055A1 (en) 1989-05-10
DE3886688D1 (en) 1994-02-10

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